Insecticides



Patented May 11, 1948 INSECTICIDES Edward R. McGovran, Hyattsville, Md., and Wilbur A. Gersdoril', McLean, Va., dedicated to the free use 01' the People in the territory of the United States a No Drawing. Application June 21, 1946,

Serial No. 678,189

3 Claims. (Cl. 167-24) (Granted under 'the act of March 3, 1883, .3 amended April so, 1928; 310 o. G. 757) This application is made under the act of March 3, 1883, as amended by the act of April 30, 1928, and the invention herein described, if patented, may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment to us of any royalty thereon.

We hereby dedicate the invention herein described to the free use of the People in the territory of the United States to take effect on the granting of a patent to us.

This invention relates to insecticides and has among its objects the provision of insecticidal compositions which in use are harmless to man and to domestic animals and which are non-injurious to buildings, furnishings and equipment, but which are highly toxrc to insects.

For this purpose, we have used a composition comprising pyrethrum and 1,3 diphenoxypropane, in varying proportions, in combination with a carrier. By actual tests, we have found that the toxic effect 01 a combination of the above ingredients is greatly'in excess of the additive effeet to be expected from the known toxic eflect of these ingredients when usedindependently. The results of these tests are illustrated by the following table:

Houseflies, Musca domestica Per cent in Kerosene limit 1.3 Dipheno- 7 mom Pyrethrum 5.0 0.01s as 1.0 0.06 14 o 0.05 so i a o 1 The composition of this invention may be com- 2,330,234

bined with carriers, such as water, acetone, liquefied dichlorodifluoromethane, kerosene, liquefied dimethyl ether, oleates, caseinates, talc, gypsum, bentonite, kaolin, slate dust, lime, rosin, pyrophyllite, and diatomaceous earth, and may be applied by spraying, atomizing, dusting, as an aerosol, and so forth, so as to bring it into contact with the insects to be destroyed. The composition may be used in dwelling houses, barns, restaurants, hotels, and in other places frequented by man and domestic animals without annoyance, harm or injury thereto, but with toxic efiect upon insects found therein, and it may be applied to bodies of water to destroy noxious insect life found there.

The above examples are not to be construed as limiting the proportions or concentrations of the ingredients used in the composition of this invention, nor as limiting either the application of this novel insecticide or the kinds of insects to which it may be applied.

Having thus described our invention, we claim:

1. An insecticidal composition comprising pyrethrum and 1,3 diphenoxypropane.

2, An insecticidal composition comprising pyrethrum and 1,3 diphenoxypropane incorporated in a carrier.

3. The process of destroying insects comprising subjecting the insects to'the action of pyrethrum combined with 1,3 diphenoxypropane.

I EDWARD R. MCGOVRAN. WILBUR A, GERSDORFF.

nmimncas crr sn The following references are of record in the Name Date Number Moyle Sept. 28, 1943 

